Island



(No Model.) 5

G. HANCOCK.

SAFETY BRAKE FOR ELEVATORS.

No. 604,247. Patented May 17,1898.

UNITED STATES PATENT CFFICE.

GEORGE HANCOCK, OF PROVIDENCE, RHODE ISLAND.

SAFETY-B RAKE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 604,247, dated May 17, 1898.

A li ation fil d November 8, 1897. Serial No. 657,891. (No model.)

To all whmn it may concern.-

Be it known that I, GEORGE HANCOCK, a citizen of the United States, residing at Providence, in the State of Rhode Island, have invented a new and useful Improvement in Safety-Brakes for Elevators, of which the following is a specification.

The falling of the elevator-car upon the breaking of the hoisting-rope is quite a common occurrence; and it is the object of my invention to provide convenient means for instantly applying a brake to check the descent of the car, the brake to be operated by the attendant who runs the elevator; and my invention consists in the combination of the elevator-car with a clamping-track arranged outside of the car, a clamping-bolt provided with a head adapted to bear against the outer edges of the track, a hand-operated nut within the car, and a friction-plate interposed between the inner edges of the track and the side of the car, as hereinafter fully set forth.

In the accompanying drawings, Figure 1 represents a detail elevation showing a vertical section of the elevator-car. Fig. 2 represents a horizontal section taken in the line 2 2 of Fig. 1.

In the drawings, A represents the elevatorwell. B B indicate two floors of the building; 0, the elevator-car; D, the hoistingropes attached to the car, and E the guiderope for starting, stopping, or reversing the movement of the hoisting mechanism.

At the side of the elevator-well A are arranged two parallel vertical bars F F, which serve to form a clamping-track for stopping the downward movement of the car 0, the said bars F F being made of uniform width and extending from the top to the bottom of the well A.

To the side a of the car C is secured the clamping-brake, which consists of the clamping-bolt G, provided with the head 79, adapted to bear against the outer edges 0 c of the vertical bars F F, which form the clampingtrack, the squared portion d, and the screw f, upon the inner end of which is placed the hand-wheel nut H, which serves to cause the required clamping action of the brake.

The friction-plate I, which is interposed between the inner edges 0' c of the bars F F and the side of the car C, is secured to the side of the car by means of the bolts 9 g, a flanged piece J also being provided at the inner side of the car to form a proper bearing for the side h of the hand-wheel nut H.

The hand-wheel nut H is placed in convenient reach of the attendant of the elevator, and upon the occurrence of any derangement of the hoisting apparatus operating to cause a rapid descent of the car the attendant can instantly clamp the car to the clamping-track by turning the hand-wheel nut H in the proper direction. The head I) of the clamping-bolt is provided with the guiding-flanges e e,which embrace the outer sides of the bars F F and serve to prevent the said bars from spreading away from each other, and the frictionplate I is also provided with guiding-flanges e e.

I claim as my invention- The combination of the elevator-car, with the clamping-track F, F, arranged outside of the car, the clamping-bolt G provided with the head 1), adapted to bear against the outer edges of the track, the hand-operated nut H within the car, and the friction-plate I interposed between the inner edges of the track and the side of the car, substantially as described.

GEORGE HANCOCK.

Witnesses:

SOCRATES SCHOLFIELD, JAMES W. BEWMAN. 

